Two players and special blocks

A bit more progress. We have two players, some special blocks and a background image.

Tomorrow hopefully we'll get some of the basic game play in (i.e. one player wins when their tower gets to a certain height). After that it will be on to making a couple of the special blocks work (cannon, shield).

This has been a ton of fun so far. My son is really getting into it and it's been fun to code side by side and push/pull from github to share our work.